A college football coach wants to know if the is a correlation between his players' leg strength and the time it takes for them to sprint 40 yards. he sets up the following test and records the data:

Every day for a week, he counts how many times each player can leg press 350 pounds. The following week, he has each player sprint 40 yards every day. The tables shows the average number of leg-press repetitions and the average 40-yard dash time (in seconds) for seven randomly selected players. What is the equation of the line of best fit? How many seconds should he expect a player to take to run 40 yards if that player can do 22 leg-press repetitions?

Leg Press (reps)|40-yard Dash (s)
15 |5.2
18 |6.3
8 |6.8
30 |8.2
26 |8.0
12 |5.3
21 |5.9

The exact equation is y = 4.536 + 0.107 Try that with all of the x values and you should get the y values listed next to the x values. Now we have to find how many seconds a player will take to run 40 yards if they can do 22 leg presses.

y = 4.536 + 0.107 * 22
0.107 * 22 = 2.354
y = 4.536 + 2.354
y = 6.89
Now to round to the nearest tenth and you should get 6.9
Good Luck!

GUYS I HAVE THE ANSWER:

LP divided by PL = Sp/Distance = Player x

You're welcome, fellow Connections Academy students.

Wow, this is depressing

lol greatest freakout ever.

So we all agree that stacie is wrong? right?

40=30/8(26+8)

I know I’m a year ahead of this post, but seriously “Dude”, this thread ended a year after you came in. It was dead, then you tried to insert your opinion.

The correct answer is the equation of the line of best fit is y=0.11x+4.54, and it would take the player 6.96 seconds to run.

Explanation:
Using technology, we calculate the line of best fit; we first enter the data points as a scatter plot, then run the regression tool, which gives us y=ax+b, where a=0.11 and b=4.54.
We now use this equation, y=0.11x+4.54, to calculate the amount of time it would take a player to run 40 yards if the player can do 22 leg-press reps:
y=0.11(22)+4.54=6.96.

here ya fools

not all my questions were the same so if yours were different aswell here you go. 1.C yes;y=1.625x

2.D no; y does not vary directly with x
-match equation to graph
3. y=2/5x-1 is D
4.-4x+6y=24 is A
5. A 51/1; your car travels 51 miles every 1 hour.
6. A 1/3
7. B -1/3
8. C undefined
9. D y-2=3(x-5)
10. C y+6=-5/8(x+10)
11. A y-16=8(x-2)
12. x=-4 the graph is B
13. A 3x+4y=12
14. A y=2x+2
15. B perpendicular
16. C neither
17. B y-3=-3/8(x+2)
18. A it ends in -3
19. C it ends with shifted 2 units left
20. graph for y=|x|-5 is A
21. graph for y= |x-4| is B
22. C negative correlation

my teacher web mailed me and said “hello! this answer is taken directly from (then the jiskha website) and now i have to complete the problem on paper and send it to her :/